D3 A8/S8 (2004 - 2010)
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4.2 Air Filter Change Procedure....
Posted by: Audis or VWs 4Life (817) on 2009-07-22 21:20:35

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Folks, those of you with 30k or more miles who haven't changed your air filter or are unsure of your air filters age, I would highly recommend changing them as soon possible. Its completely DIY on the scale of 1 to 10 where a ten is trannie rebuild, I would list this as a 1.

Again do all this work at your own risk I take no responsibility for anything that may go wrong in your situation.

Its 5 screws on the airbox and two on the MAF. The bottom screw is a real PIA unless you have the right tools.

Required tools are Philips head screw driver, with an extra long shank (10-12") and a power screw driver with the ability to handle a tight 90 degree turn. Alternatively an extra short shank short handle Philips head could work. A good source of light would be advised too as a few of these screws are pretty deep.

Undo the first 5 screws on the airbox.

Note the 5 screws on the airbox won't come out. They are held in by the plastic case so don't worry about loosing them in the bottom of the engine bay. Just get them loose enough maybe a dozen turns. The long shank screw driver is a must have unless you have hands small enough to get between the headlight housing and the airbox. That screw is down pretty deep.

Then undo the two screws on the MAF. The top one is cake. This screw comes all the way out so be careful and keep your fingers on it.

The bottom screw not so much.
There are a lot of hoses in the way, its even hard to photograph.

This is where the power screw driver that can do 90 degree turns or a very small shank philips helps.

I put a little tape on my power screw driver to keep the bit from falling out.

Gently pull the airbox cover directly upward. Pull strait up and you'll see that the flex hose at the front has guides that force the airbox cover up in a very direct manner. Gently move the MAF aside, the pipes are slightly couple and little bit of movement is okay to separate them. Try not to put any pressure on MAF's honey comb plastic grill. These can be fragile.

Replace the air filter element with either a stock replacement part or an aftermarket OEM. I used a Hengst air filter. It actually looks better then stock double the folds in the filter element its self.

Here is what my old filter looked like....

Can you say YUCK!

Vacuum out any debris at the bottom of the airbox, insert the filter element on the plastic ring and gently guide the airbox lid back into place. Make sure you light it up with the flex hose. As you're dropping back the box top, reinsert the MAF. Get it all snapped back into place, and then start screwing back the top of the MAF to the airbox. Don't tighten it down until you get the bottom screw mid way or slightly tightened as well. Then tighten both screws up, and tighten up your 5 airbox screws.

Start your car up, drop the hood and enjoy the extra ponies that managed to escape in the past several thousand miles.
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